​Hackers have reportedly leaked onto the web highly sensitive sexual information of nearly 4 million users registered on leading dating site Adult FriendFinder, which claims to cater for up to 63 million people worldwide.

Information stolen from the site’s database reportedly gives away
users' sexual orientation and preferences, along with their email
addresses, dates of birth and even unique internet addresses of
computers. It also specifies whether users of the dating service
are looking for extramarital affairs.

According to a Channel 4
News investigation, the hackers did not even spare
old members who had already deleted their accounts from the
dating site. The investigation allegedly revealed a secretive
forum in which a hacker nicknamed ROR[RG] posted the details of
users of Adult FriendFinder, claiming that the information of 3.9
million members has been leaked. Shortly after the leak, hackers
on the forum reportedly said they were going to hit users with
spam messages.

The dating source has
launched an investigation and said it is "working closely"with police.

"FriendFinder Networks
Inc. has only just been made aware of this potential issue and
understands and fully appreciates the seriousness of the
issue,"the company
said in a statement, adding that until the investigation is
completed, it's hard to evaluate “the full scope of the
incident.”

According to Channel 4,
at least one former FriendFinder member, Shaun Harper, has fallen
prey to the hackers' attack. "The site seemed OK, but when I got
into it I realized it wasn't really for me, I was looking for
something longer term. But by that time I'd already given my
information. You couldn't get into the site without handing over
information.

"I deleted my account, so
I thought the information had gone. These sites are meant to be
secure."

He said he had been
targeted with virus-infected emails since his personal data was
exposed.